A simple plugin allows you manage your client's testimonial.
You can insert your client's testimonial and display it at front-end by slider or grid.
Shortcode [c4d-testimonial-slider count="10"][/c4d-testimonial-slider]
This plugin is used in C4D Vision - Responsive WooCommerce Theme
You can view here
http://coffee4dev.com/responsive-woocommerce-theme-c4d-vision/